Alternatingly stacked 2D/2D hybrid via preferential intercalation of nitrate ions between layered double hydroxide and graphene oxide
Alternatingly stacked 2D/2D hybrid via preferential intercalation of nitrate ions between layered double hydroxide and graphene oxide
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DOI：
10.1016/j.matchemphys.2022.127203
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发表时间：
2022-12
影响因子：
4.6
通讯作者：
Saifon Kullyakool;Kazuto Hatakeyama;P. Khemthong;S. Babel;K. Laohhasurayotin
中科院分区：
文献类型：
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作者：
Saifon Kullyakool;Kazuto Hatakeyama;P. Khemthong;S. Babel;K. Laohhasurayotin
本研究在氧化石墨烯(GO)薄层上制备了具有硝酸根离子插层的锌铝层状双氢氧化物(LDH)纳米杂化复合材料。与普通LDH/GO复合材料中碳酸盐离子插层LDH不同，杂化是通过可交换的硝酸根离子实现的，从而允许后续的GO和LDH在纳米水平上的相互作用。将高剥离度的GO引入共沉淀锌、铝离子，使锌铝离子的质量分数达到10~30%。用多种技术对制备的杂交种的性能进行了表征。这种混合设置提供了两种材料的协同效应，并有利于其物理化学性质，包括GO片材上LDH颗粒的尺寸控制、更高的比表面积和介孔，以及提高碳燃烧温度使其耐热。通过对阳离子染料和阴离子染料亚甲基蓝和甲基橙的去除，证明了其有效的吸附性能，分别达到81和83 mg/g，而且由于其稳定性的提高，仍然可以回收。广角X射线衍射仪揭示了在GO参与和不参与的情况下LDH的快速形成机理，表明LDH中间体最初形成，后来重新结构为更均匀的纳米杂化。研究结果表明，在易沉淀条件下可以形成2D/2D杂化体系。它在水净化、控制释放和输送系统等方面具有广阔的应用前景。
In this study, zinc-aluminum layered double hydroxide (LDH) with nitrate ion intercalation was developed to form a 2D/2D nanostructured hybrid composite on graphene oxide (GO) thin layers. Differing from ordinary LDH/GO composites where carbonate ion intercalation took place in LDH, the hybrid was achieved with exchangeable nitrate anion, hence allowing the subsequent GO and LDH interaction at the nanoscale level. Highly exfoliated GO product was introduced to the co-precipitation of zinc and aluminum ions at 10–30 %wt. compositions. Properties of the prepared hybrid were characterized by several techniques. This hybrid setup offered a synergistic effect of the two materials and benefitted the physicochemical properties including size-control of LDH particles on GO sheet, higher surface area with mesoporosity, and increased carbon combustion temperature making it heat resistant. The efficient adsorption property was then proven by the removal of both cationic and anionic dyes, i.e., methylene blue and methyl orange, up to 81 and 83 mg/g, respectively, and still recoverable due to its improved stability. The fast-forming mechanism of LDH, with and without GO participation, was revealed by the wide-angle x-ray diffraction, suggesting the initial formation of LDH intermediate that later re-structured to a more uniform nanohybrid. The findings of the study suggest that the 2D/2D hybrid system can be formed under facile precipitation. It is promising for water decontamination, controlled release, and delivery system.